Hydrolevel 3250 - Manual (Page 9)

9
TROUBLESHOOTING
Burner Will Not Fire See Flow Chart 1, page 10
Burner Will Not Shut Down See Flow Chart 2, page 11
Temperature Display Exceeds
High Limit Setting
Under normal operation, boiler temperature will continue to rise after the control shuts off
the burner. This condition, known as “thermal stacking”, results from hot boiler surfaces
continuing to release heat into the boiler water.
No or Insufficient
Domestic Hot Water
For boilers equipped with a tankless coil, make sure the low limit setting on the HydroStat
is set properly. NOTE: If the low limit setting is dialed fully counter clockwise, it will shut
off the low temperature maintenance feature and will function as a cold start control. If
installed with an indirect water heater, check that the Zone/Indirect Switch is set in the
Indirect (I) position. Verify that the end switch in the relay box controlling the indirect water
heater is connected to the ZC-ZR terminals. This will ensure that the domestic water calls
are prioritized. (see “Heating and Indirect Water Heater” on page 4-6).
Boiler Will Not Maintain
Low Limit Temperature
Check for overlapping high temperature setting. If the high limit setting is set below the
low limit setting, the control will default to the high limit setting and the corresponding
high limit differential setting.
House Will Not Get
or Stay Warm
1. Check for air-bound radiators. 2. Check thermostat settings including heat anticipator
settings (common on non-digital thermostats). 3. Check the Economy setting. The
Economy feature, much like outdoor reset controls, lowers average boiler temperature
and can slow or, in some cases, prevent the house from coming up to temperature.
Move to a lower setting (see “Setting the Economy Feature” on page 7).
Circulator Contacts
C1 and C2 Not Energized
on Call for Heat
Check to see that boiler water is at or above 120°F. On a call for heat, the control will not
permit the circulator to operate if the boiler water temperature is below 120°F.